作者domeself (be strong)
看板GMAT
标题[计量] GWD 1-17
时间Fri Dec 21 22:29:45 2007
If x,y,and k are positive numbers such that (x/x+y)(10)+(y/x+y)(20)= k
and if x < y, which of the following could be the value of k ?
A.10
B.12
C.15
D.18
E.30
ANS: D
麻烦各位大大帮忙解答 谢谢
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